Scroll-sawing machine



' (No Model.)

H. L. BEACH.

SCROLL SAWING MAGHINE.

No. 856,186. Patented Jan. 18,1887.

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HENRY L. BEACH, OF MONTROSE, PENNSYLVANIA.

SCROLL-SAWING MACl-HNE.

SPECIFICATION forming part of Letters Patent No. 356,186. dated January 18, 1887,

Application filed April 30, 1836. Serial No. 200,033.

To all whom it may concern.-

Be it known that I, HENRY L. BEACH, of l\Iontrose,Susquehanna county, Pennsylvania, have invented Improvements in the Construction of Scroll-Saws; and I do declare the following to be a full, clear, and correct'description of my invention, reference being had to the accompanying drawings, making part of this specification, and to the letters of reference marked thereon, in which Figure 1 is a perspective view of my improved scroll-saw, the front portion of the table being partially broken away. Fig. 2 is a view of a portion of the semicircular plate, the bellows, and of one of the ratchet-wheels employed. Fig. 3 is aside view, enlarged, of Fig. 1. Fig. 4 is a front view of the lower crosshead and the guideways. Fig. 5 is a rear View of the guideways and the supporting-plate. Fig. 6 is an end View of Fig. 5.

In the drawings, like parts of the invention are designated by the same letters of reference.

The nature of the invention consists in improvements, as more fully hereinafter set forth, in scroll-saws, and will be found to relate more particularly to the means for straining and operating the saw, the object of the invention being the construction of these means, so that the saw shall be properly strained, easily op erated, and friction of the working parts be greatly reduced.

To enable those skilled in the arts to make and use my invention,I will describe the same.

A shows a tubular support, to the upper end of which is secured a semicircular plate, B, provided upon its rear side with lugs or stops Z) to govern the throw of the arms 0.

G are arms ,of wood or iron,pla'ced upon each side of the tubular support A. To the forward ends of these arms are attached the upper ends of a strap, D, made of steel or any flexible material, and its lower end attach ed to the cross-head E, in which the upper end of the saw F is held. Upon the outer ends of these arms are secured the plates G, recessed, as at 9, within which recesses are received the downwardly-projecting lips h of the top plates of the links H. The bottom plates, '5, of these links II are provided with recessed boxes It,

within which are received the downwardly- (No model.)

] projecting lips Z, formed upon the ends of the plates m, to which are attached the ends of the first coil ot'the spiral springs I.

J are journals passed through bearings J secured upon the semicircular plate B, over which the spiral springs I are Wound. The first coil of these springs is attached to the collars m, and the rear ends of the springs I are stopped by the lugs or projections on the journals J. While the springs I are wound over thejo'urnals J, there is no point of contact be tween theinterior of the springs and thejournals.

Upon the forward ends of the journals J and face of the semicircular plate B are the ratch etwheels L, with which engage the teeth upon the ends of the ratchet-levers M, journaled above the ratchet-wheels L upon the plate B.

The forward ends of the jou rnalsJ are squared 7o up, so that they can be readily turned by a wrench, and the tension of the springs I increased or diminished, as desired.

Upon a projection, 42, ot' the plate B,on one side, is placed a bellows, K, made air-tight and the same free from sawdust as the saw is oper- .80

ated, the bellows being expanded by downward movement of one of the arms 0 and compressed by its upward movement. The upper cross-head consists of a plate, E, having in clined sides and free to move in the V-shaped 8 guideways Q. To it, at its upper end, is attached the lower end of the strap D, and at its lower end is the slotted hook R, to receive the upper end of the saw F.

F is the saw, held and carried by the upper 0 cross-head described and a lower cross-head,

of which the following is a description.

To-the guide-plates S are bolted the guideways T. The cross-head U is made up of a flat plate, V, of metal, provided with the ob- 5 long slots 0. This plate V is positioned upon the face of the gibs W, formed of wood or metal, and is bolted to the same by bolts passed through the slots 12.

incident upon their movement can be taken up or corrected by loosening the bolts secur- The gibs W are free to 1 move in the guideways T, and the lost motion IOO ing the plate V to them, bringing the gilos W closer together relatively to the guideways T, and tightening the bolts. It will be observed, in this connection, that the position of the guideways T relatively to the bed of the machine is never disturbed. This is a novel and important feature, as ordinarily the guideways in the case of lost motion are readjusted and their position relatively to the bed of the machine is varied.

XVhen constructed as described, the guideways can be permanently positioned in the manufacture of the machine.

A further advantage results from this mode of construction. The guidewaysTare bolted to the plates S outside, or nearly so, thebearings of the gibs \V. \Vhen the cross-head, run ning snugly in its bearings, causes the guideways T to become heated, they will expand toward each other, loosen the cross head, and at the same time the heating is diminished. Thus no side vibration of the saw is possible under these conditions.

Xshows the clamp for holding the lower end of the saw, and riveted to it.

Y is a connection connecting the lower crosshead to a wheel, Z, by which the machine is operated.

Such being the construction, the operation will be readily understood. The saw F is positioned within the upper, E, and lower, U, crossheads. The proper degree of tension is given to the springs I by turning the journals J, as already stated, and motion is communicated to the lower cross-head, U, through the connection Y and wheel Z. The saw is drawn down through this movement ot'the lower cross head, the arms 0 are depressechand the springs I are compressed, and after the saw has made its downward stroke it is returned to its former position through the continued motion of the wheel Z, the expansion of the springs I, and the arms 0, strap D, and the upper crosshead, E, connected to the springs I, as already described. During the downward movement of the saw the bellows K have been expanded, and a current of air passes through the tube N to the table 0, for the purpose of keeping the same free from sawdust, and on the return movement of the saw the bellows is compressed.

In the construction of the present machine I have aimed to avoid as much as possible the presence of friction incident to this class of machines, which necessarily are run at ahigh rate of speed. Thus while the springs are wound over the journals there is no contact between the interior of the same and thejournals. The recessed plates G and recessed boxes k are intended to be filled with oil or proper lubricating matter, so that these bearings are properly lubricated; and the particular mode of constructing the lower guideways, T, and the gibs IV has been fully set forth. Aside from this fact, all the parts of the machine are easily reached and readily adjusted as deemed necessary.

Having now set forth myinvention, I claim as new-- 1. The combination of the semicircular plate B, the side levers or arms, C,with the strap D, having its upper ends attached to the lovers, and the cross-head E,attached to the lower end of the strap, the plates G, recessed as at g, and attached to the outer ends of the arms or levers O, the side links, H, having the bottom plates, '5, and recessed boxes k, and the spiral springs I, engaging the boxes 70, all positioned above the saw F, constructed and operating substantially as and for the purposes set forth.

2. The combination of the semicircular plate B,the side levers or arms, 0, with the strap 1), having its upper ends attached to the levers, and the cross-head E, attached to the lower end ofthe strap, the plates G, recessed as at g, and attached to the outer ends of the arms or levers G, the side links, H, having the bottom plates, '5, and recessed boxes k, the spiral springs I, engaging the boxes k, shafts J, ratchet-wheels L on said shafts, and ratchetlevers M, all positioned above the saw F, constructed and operating substantially as and for the purposes described.

HENRY L. BEACH.

In presence ol' 0. N. YVARNER, T. .T. Davrns. 

